/Engine/Source/Developer/AssetTools/Public/AdvancedCopyCustomization.h
Once the destination map is generated for the set of assets, the destinations can be manipulated for renaming, restructuring, etc.
virtual void TransformDestinationPaths ( [TMap](API\Runtime\Core\Containers\TMap)< [FString](API\Runtime\Core\Containers\FString), [FString](API\Runtime\Core\Containers\FString) > & OutPackagesAndDestinations ) const